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Amazon [amazon.com] has 30-Piece Mega Bloks Move N Groove Caterpillar Train for $ 7.34. Shipping is free w/ Prime or on $ 25+ or $ 35+ orders (minimum requirement varies by location).
Target [target.com] has 30-Piece Mega Bloks Move N Groove Caterpillar Train for $ 7.34. Shipping is free on orders $ 35+. (RedCard holders receive free standard shipping on most items and free 2-day shipping on eligible items)